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What does the “__block” keyword mean?
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It tells the compiler that any variable marked by it must be treated in a special way when it is used inside a block. Normally, variables and their contents that are also used in blocks are copied, thus any modification done to these variables don't show outside the block...
Node.js Best Practice Exception Handling
... error condition?
if ( y === 0 ) {
// "throw" the error safely by returning it
return new Error("Can't divide by zero")
}
else {
// no error occured, continue on
return x/y
}
}
// Divide 4/2
var result = divideSync(4,2)
// did an error occur?
if ( res...
What's the difference between '$(this)' and 'this'?
...s going to be in the first element.
$("#myDiv")[0] === document.getElementById("myDiv");
And so on...
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What command opens Ruby's REPL?
What command opens Ruby's REPL?
2 Answers
2
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System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
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System.currentTimeMillis itself is not affected by time zone. Changing system time will affect System.nanotime in the same way as System.currentTimeMillis
– Viktor
Jun 27 '17 at 16:00
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How set the default repository
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Yeah, tonfa's right on both counts. You do it by editing a file and if you don't want to pop open an editor you could do it by shell redirect. There's no 'set' command.
– Ry4an Brase
Sep 27 '10 at 13:56
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- how to allow only one item selected?
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You want only one option by default, but the user can select multiple options by pressing the CTRL key. This is (already) exactly how the SELECT multiple is meant to behave.
See this: http://www.w3schools.com/tags/tryit.asp?filename=tryhtml_select_...
SQL: How to get the count of each distinct value in a column?
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SELECT
category,
COUNT(*) AS `num`
FROM
posts
GROUP BY
category
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Removing the fragment identifier from AngularJS urls (# symbol)
... Because IE lt 10 doesn't support html5 history API which were enabled by setting up html5Mode(true). In IE you have to use # in routes.
– Maxim Grach
Feb 8 '13 at 16:50
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Stop form refreshing page on submit
...lt() will stop the submit.
Without jQuery:
var form = document.getElementById("myForm");
function handleForm(event) { event.preventDefault(); }
form.addEventListener('submit', handleForm);
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